Ridge expander drill



FIG. 1 is a first perspective view of an embodiment of a ridge expander drill according to my design;

FIG. 2 is a second perspective view thereof;

FIG. 3 is an elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a ridge expander drill, as shown and described. 